EP1185442B1 - Dispositif et procede de surveillance de siege a l'aide d'une technique de triangulation optoelectronique - Google Patents

Dispositif et procede de surveillance de siege a l'aide d'une technique de triangulation optoelectronique Download PDF

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Publication number
EP1185442B1
EP1185442B1 EP99931166A EP99931166A EP1185442B1 EP 1185442 B1 EP1185442 B1 EP 1185442B1 EP 99931166 A EP99931166 A EP 99931166A EP 99931166 A EP99931166 A EP 99931166A EP 1185442 B1 EP1185442 B1 EP 1185442B1
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EP
European Patent Office
Prior art keywords
image
image sensor
light source
sensor array
airbag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99931166A
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German (de)
English (en)
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EP1185442A1 (fr
Inventor
Matthias Hillebrand
Bedrich Hosticka
José SANTOS CONDE
Nenad Stevanovic
Andreas Teuner
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Publication of EP1185442A1 publication Critical patent/EP1185442A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01538—Passenger detection systems using field detection presence sensors for image processing, e.g. cameras or sensor arrays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/46—Indirect determination of position data
    • G01S17/48—Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/50—Depth or shape recovery
    • G06T7/55—Depth or shape recovery from multiple images
    • G06T7/586—Depth or shape recovery from multiple images from multiple light sources, e.g. photometric stereo
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/50—Context or environment of the image
    • G06V20/59—Context or environment of the image inside of a vehicle, e.g. relating to seat occupancy, driver state or inner lighting conditions
    • G06V20/593—Recognising seat occupancy

Definitions

  • the present invention relates to a device and a method for seat monitoring in motor vehicles and in particular a device and a method for optical Seat monitoring, which is used to control the activation state one or more airbags.
  • a centrally located airbag is designed in the event of an accident trigger when a person stands upright the seat.
  • SRS Supplemental Restrain System
  • the airbag supports the restraining effect of the belt with a frontal one Collision and avoids direct impact contact of the thorax, neck and head on the dashboard.
  • An airbag usually fires 10 to 40 ms after the start of the collision, if the collision-related speed change exceeds a predetermined amount, which is 25 km / h in Europe and 15 km / h in the USA.
  • the airbag envelope kicks in at a speed of 250 to 300 km / h the airbag cover, the inflation time being 25 to 40 ms and is therefore faster than the eyelid reaction. First after this inflation time is the full protective effect of the airbag guaranteed.
  • OOP Out of Position
  • a for seat occupancy detection capacitive measurement of the object which is usually a dielectric represents that between the seat and instrument panel located. There are electrodes for this mounted in the seat and in the instrument panel. With With the help of the permittivity measurement it is possible to determine the occupancy status recognizing a seat, making an error-free distinction usually not between man and object will succeed.
  • Methods for child seat detection are also known are based on the use of special child seats with Transponder technology are equipped. This transponder in the child seats deactivate the airbag. This on the However, methods based on transponder technology enable neither the detection of foreign child seats nor the detection of vehicle occupants.
  • the airbag activation and deactivation is one a danger zone immediately in front of the airbag to define and this zone with the help of a light curtain or to monitor a light barrier. Will the light curtain or breached the light barrier, which indicates that if a person is in the endangered zone, the Airbag deactivated.
  • an optical position sensor for Capture a three-dimensional profile such as that used for seat monitoring can be used in motor vehicles.
  • Optical triangulation is used to cover the area and approximately determine the profile of an object.
  • a diode array is provided for this purpose, each Diode of the array is turned on sequentially individually generate a set of time-multiplexed optical beams.
  • a photodiode array is provided in order to to generate current values from the optical beams, from which finally, an approximate measure of the three-dimensional Profile and the position of the object is obtained.
  • the main problem of the optical methods mentioned above Seat monitoring using active light sources is due to the extreme lighting differences in a motor vehicle can occur.
  • the lighting can between 1 mlx in the dark night to 100 klx at direct sunlight may vary.
  • active monochromatic sources to be monitored Light rays emitted in the room can no longer be resolved. Due to the legal, country-specific safety regulations to comply with the radiation safety of Laser beams are also only allowed to use a small amount of light be emitted from the monochromatic light source.
  • the object of the present invention is a Device and a method for seat monitoring in motor vehicles to create a quick detection of the Seat occupancy for activating or deactivating an airbag enable in any lighting conditions
  • the present invention provides a seat monitoring device in motor vehicles that have a pulsed monochromatic light source for brief exposure of a to be monitored room.
  • an image sensor array to take a picture of what is to be monitored Space provided that a global electronic locking device which has a setting of the exposure time of the image sensor array independently of a read cycle of the image sensor array enables.
  • a synchronization device to synchronize the operation of the pulsed operated laser source and the image sensor array provided.
  • the device according to the invention a control device for controlling the light source and the Image sensor arrays to to during an exposure of the monitoring room at a first time a first image of the same, and to do without an exposure of the monitoring room at a second time a second image to generate the same.
  • a facility is provided order a difference signal from the first and the second image to create.
  • the device according to the invention is suitable on the one hand for Application of the optical light section principle to the contour to determine an object on a seat to be monitored and thus recognize the object on the seat.
  • the device according to the invention is suitable to determine the distance of a person or an object to an airbag itself, so that with sudden movement a person towards the airbag if the airbag is too small Distance can be deactivated. It is preferred to use a multi-zone exam that is performance-matched Airbag deployment allowed.
  • the image sensor array of the device according to the invention Seat monitoring is preferably a CMOS / CCD image sensor global shutter function together with a monochromatic Illumination source at a suitable location in the Motor vehicle, for example in the headliner, on the instrument panel or in the cowl.
  • Global shutter function means that a closure device is provided is the simultaneous electronic closure of all Allows sensor elements of the sensor array.
  • differential image signals are used to evaluate a scene used that an image acquisition with very briefly pulsed active lighting and image acquisition come from without pulsed lighting.
  • the pulsed and the unpulsed picture i.e. the image without exposure through the Light source, become consecutive with a minimal interval added.
  • the device according to the invention thus works extremely susceptible to interference, even under extreme environmental conditions.
  • An interference filter can also preferably be used be used in front of the image sensor array, which on the Wavelength of the from the monochromatic illumination source emitted light beam is matched, so that in addition a significant proportion of the stray light can be suppressed can.
  • the triggerable in the difference image generated according to the invention Differences in intensity can subsequently be applied conventional analysis methods of digital image processing and pattern recognition are evaluated, whereby For this purpose, particular use is made of experience can be used in the field of industrial surveying technology with light section systems under defined lighting conditions were acquired.
  • Triangulation method used to measure the distance of one Occupants, if recognized, from the airbag to determine, then based on the distance determination control the activation state of the airbag.
  • the present invention also provides a method for Seat monitoring in motor vehicles, in which initially a too monitoring room using a pulsed monochromatic Light source using an exposure time exposed in the micro or nano-second range becomes. During this exposure, a first picture of the monitoring room recorded by means of an image sensor array. A second picture of the room to be monitored without one Exposure of the same by the light source becomes a maximum of 10 ms before or after taking the first picture. The first and second images then become a difference image generated.
  • the present invention is based on the finding that for trouble-free seat monitoring in motor vehicles Devices and methods that can be used Difference image from a first image taken during an exposure is taken, and a second picture, which at missing exposure is generated.
  • Difference image from a first image taken during an exposure is taken, and a second picture, which at missing exposure is generated.
  • For the Generation of such a signal evaluation interference-prone differential image signal must meet some requirements be fulfilled.
  • First, short-term exposure Light pulses in the micro or nano-second range are used so that the highest possible light output minimal light energy can be emitted. Further must minimal time intervals between the pulses recorded and non-pulsed images are used, to minimize disturbances caused by object movement.
  • the above requirements may apply to the invention Device by using an image sensor array a global electronic shutter and one Synchronization device for synchronizing the operation the pulsed light source and the image sensor array will be realized.
  • pulsed light sources are used very short exposure times in combination with an image sensor array, the correspondingly short global exposure times enables and that with the active exposure source is synchronized. This is the only way to get the opportunity created, even under extreme lighting conditions the structured emitted by the light source To emit light with an energy that also when exposed to sunlight the detection of that reflected from an object Light allows without harm to health with direct eye radiation from laser sources or focused LEDs can occur.
  • the Combination of pulsed light sources with structured Lighting and the use of an image sensor array, preferably a CMOS / CCD image sensor, with global Locking device and adjustable integration times in Micro and nano-second range a particularly advantageous Seat monitoring system that is suitable, for example used to control an airbag activation state can be.
  • the present invention thus enables by generation of a difference image the elimination of extraneous light influences due to direct sunlight, shadows, back light, Lantern light and the like, only the Invisible, narrowband near infrared portion of the light source a contribution to what is to be evaluated by forming the difference image Signal delivers.
  • the light source 2 is preferably a laser diode or LED, which is preferably in invisible near infrared range, 700 nm to 1100 nm, Light emitted.
  • an optical device 4 for Forming a fan of light arranged.
  • the device 4 is preferably a cylindrical lens or a diffraction grating.
  • the image sensor array 12 is preferably a CMOS / CCD image sensor that has a resolution of at least 128 x 128 pixels and a globally adjustable synchronous Has exposure time that is independent of the shutter speed of the Pixel values can be controlled. This will give you the opportunity created, also in the micro and nano-second range to expose. To realize this short exposure time, the light source 2 becomes very suitable with very short pulses Length operated, the light source 2 and the image sensor array 12 operated synchronized, as by a line 14 is shown schematically.
  • control electronics 16 for the CMOS / CCD image sensor and the illumination source provided for synchronizable lighting.
  • the control electronics 16 together with the image sensor array enable which is a global electronic locking device which has a setting of the exposure time of the image sensor array independently of a read cycle of the Image sensor arrays allow imaging with exposure and taking an image without exposure with a time interval of less than 10 ms added. So it is with the device for seat monitoring according to the invention possible that a refresh rate at which one Scene is recorded, in the range of 100 to 1000 frames / s lies, so that control of an airbag in the millisecond range can be guaranteed.
  • the time interval between the two images above, one with active lighting and one without active lighting must be less than 10 ms for continuous movements no misinterpretation of the difference images in the room, on which the signal evaluation is based.
  • the formation of the difference image can be done directly on the CMOS / CCD image sensor chip or alternatively also in one field programmable gate array, an application-specific integrated circuit, a microprocessor or one Microcomputer done.
  • the device for forming the Difference can thus be part of the control electronics or be realized separately from the same.
  • Seat monitoring device is also an interference filter provided that shown only schematically in Fig. 1 and is designated by the reference numeral 18.
  • the pass frequencies the optional interference filter disk 18 are on the wavelength of the from the monochromatic light source 2 emitted light beam tuned. By this measure stray light can be further suppressed.
  • the interference filter disk 18 both in front of the image sensor 12 and arranged in front of the light source 2, it is enough optionally off if it is only in front of the image sensor 12 or the receiving optics 10 is arranged.
  • a signal processing electronics provided what is shown schematically in Fig. 1 by a connection 20 is displayed, which is used to evaluate the difference image and to connect the signal, the information about the assignment of the seat to the airbag control electronics, serves.
  • the signal processing electronics uses that of the Image sensor array generated differential signals on the one hand Performing object detection and secondly performing a distance measurement based on the triangulation principle, to the briefly referring now to FIG. 1 is received.
  • the light source 2 projects a light beam 6 at an angle ⁇ in a scene in which, for example an object 8 is arranged. This results a spot of light at position x on the image sensor array, if the object is at the distance drawn by the solid Line 8 is shown is arranged.
  • the object is located closer to the image sensor, it creates a spot of light the position y on the image sensor array while it when it is further away from the image sensor the position z of the image sensor array.
  • an embodiment for an image sensor element of the image sensor array in which it is is preferably a CMOS / CCD image sensor.
  • An inexpensive image sensor is preferably used Camera system for high speed cinematography with a sensor chip based on standard CMOS technology used. Such a system is cheaper than classic ones high-speed opto-mechanical or opto-electrical recording systems.
  • CMOS technology offers structures of CCD picture elements a flexible design of picture elements.
  • the cointegration of signal reading and signal processing various functions can also be implemented on the chip, which also reduces power loss as well as the manufacturing costs of the entire system.
  • the CMOS sensor for high-speed cinematography is preferably in a standard CMOS process with a n-well depth of 1 ⁇ m with 128 x 128 pixels and has a linear transmission characteristic for the incident Light on.
  • the CMOS sensor has a global electronic Shutter, a so-called shutter, which is a simultaneous All pictures can be captured in all pixels. This Global electronic lock is necessary to prevent any Smearing caused by fast moving objects excluded. Furthermore, this closure can complete decoupling of exposure time and reading cycle will be realized.
  • FIG. 2 A sensor element of such a CMOS sensor, which represents a pixel, using a photo element PD is shown schematically in FIG. 2.
  • an n + -diffusion-p-substrate photodiode is used as the photo element PD due to its fast impulse response to the incident light.
  • the cathode of the photodiode is connected to a reference voltage V ref via a reset switch M1, which is implemented by a transistor.
  • the anode of the photodiode is at ground.
  • a photocurrent I ph is generated by light incident on the photodiode PD.
  • the cathode of the photodiode Pd is also connected via a closure transistor M2 to a first terminal of a storage capacitor C S , the second terminal of which is grounded.
  • the storage capacitor C S is also connected at its first connection to transistors M3 and M4, which are provided for reading out the charge stored on the storage capacitor C S.
  • global control signals 40 reset signal and 42 (shutter signal), which are used in common for all sensor elements, are set to a high level in each pixel in order to bring the storage capacitor C S to the reference voltage V ref recharge.
  • the transistors M1 and M2 function as switches.
  • the reset signal 40 is set to 0, whereupon the integration begins.
  • the storage capacitor C S is discharged in each pixel.
  • the integration ends when the shutter signal 42 is set to 0.
  • the readout of the charge stored on the storage capacitor C S can now begin via the transistors M3 and M4, the row-by-row readout being activated by raising a row selection signal 44 (row select).
  • CMOS sensor as well as the whole with the same realized camera system, meet all requirements of modern recording systems for high read rates, i.e. more than 1000 frames per second, no smearing, no blooming effects, very short exposure times and a linear transmission characteristic. These features are special also for the recording of fast moving Objects of essential importance. So this sensor is excellent for seat monitoring in motor vehicles, for timely control of the activation state of airbags.
  • An image sensor array consisting of a plurality, for example 128 x 128 pixels, of image sensor elements shown in FIG. 2 is the main component of a CMOS high-speed camera represents their control or signal processing electronics for example by an FPGA module can be realized, as can be seen in Fig. 3.
  • 3 is shown schematically the sensor module 50, which with the FPGA module 52 is connected, the FPGA module 52 further with an LED / laser diode 54, which is preferably in the invisible Infrared range works, connected to one synchronous operation of sensor module 50 and light source 54 to enable.
  • the FPGA module includes, as explained above was, preferably the control electronics of the seat monitoring device.
  • the FPGA module is preferably a Interface module 56 with a computing device 58 which preferably be a microprocessor or a microcomputer can, connected.
  • the distance of an object or person to the airbag cover determine. Through a multi-zone examination can now decide whether and how the airbag a potential collision has to be activated. Depending on the determined distance of the person to the airbag cover is too decide whether to activate or deactivate the airbag, or whether the performance of the airbag to the determined distance to be adjusted, or whether a multi-stage connection should be done.
  • a person 70 is on the seat 72 of a motor vehicle, the person 70 is in a bent position.
  • This leaned over Position is by the seat monitoring device according to the invention 4, in each case the light fan the light source 54 is shown schematically.
  • the seat monitoring device according to the invention becomes a Generated light section that in the right part of Fig. 4 with the Reference numeral 80 is designated.
  • the detection area is divided into three sections, an airbag deactivation section 82, a section 84 for performance-adjusted airbag deployment, and one Airbag activation section 86.
  • FIG. shown state represents the seat monitoring device thus, the occupant 70 is partially in the airbag deactivation zone 82 located, and thus in one too short distance from the airbag 100, so that a deactivation of the airbag is effected.
  • Fig. 4b the occupant 70 is in a normal sitting position shown, so that is on the right side in 4b) shows the sectional image 90 shown. How to recognize the sectional image is completely in the airbag activation area 86 so that the airbag activates normally to ignite in the event of a potential collision.
  • the sectional images shown in Figs. 4a) and 4b) each recognized by a pattern recognition that a Occupant 70 is positioned on motor vehicle seat 72.
  • Possible positions for the arrangement of the invention Seat monitoring devices are at 94 and 96 in Fig. 4c) shown.
  • the measuring system of the invention Seat monitoring device as already stated above was at a suitable location in the motor vehicle, for example in the headlining, on the instrument panel or in the Cowl are attached, with the reference number 94 in Fig. 4 the instrument panel is displayed while with the headliner is shown by reference numeral 96 in FIG. 4c) is.
  • the device and the method can be used according to the present invention can advantageously to an airbag activation control in Motor vehicles to perform.
  • the system according to the invention can be adapted accordingly can build a three-dimensional camera system that can monitor the entire interior of a motor vehicle to all danger zones in the area of the numerous airbags in a motor vehicle, for example the side airbags etc., and monitor the activation status of each Control airbags accordingly.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Artificial Intelligence (AREA)
  • Air Bags (AREA)

Claims (9)

  1. Dispositif de surveillance de siège dans des véhicules, ayant les caractéristiques suivantes
    une source de lumière (2 ; 54) monochromatique, alimentée de manière pulsée, pour l'exposition momentanée à la lumière d'un espace à surveiller ;
    un réseau de capteurs d'images (12 ; 50) pour enregistrer une image de l'espace à surveiller, avec un dispositif électronique global de fermeture (M1, M2) permettant le réglage du temps d'exposition à la lumière du réseau de capteurs d'images (12 ; 50) indépendamment d'un rythme de lecture du réseau de capteurs d'images (12 ; 50) ;
    un dispositif de synchronisation pour la synchronisation du fonctionnement de la source de lumière (2 ; 54) alimentée de manière pulsée, et du réseau de capteurs d'images (12 ; 50) ; et
    un dispositif de commande (16 ; 52) pour la commande de la source de lumière (2 ; 54) et du réseau de capteurs d'images (12 ; 50) afin de produire, pendant une exposition à la lumière de l'espace à surveiller, une première image de cet espace à surveiller dans un premier temps, et afin de produire une deuxième image de l'espace à surveiller dans un deuxième temps, sans exposition à la lumière de cet espace à surveiller ; et
    un dispositif (58) pour produire une image différentielle à partir de la première image et de la deuxième image.
  2. Dispositif selon la revendication 1, dans lequel le temps d'exposition à la lumière de la source de lumière (2 ; 54) se situe dans la plage des microsecondes ou des nanosecondes, et dans lequel le premier et le deuxième temps sont espacés au maximum de 10 ms.
  3. Dispositif selon la revendication 1 ou 2, qui présente en outre un filtre de lumière interférentielle (18) devant le réseau de capteurs d'images (12 ; 50), dont la fréquence de filtration est accordée à la longueur d'onde de la lumière d'exposition de la source de lumière (2 ; 54).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, dans lequel la source de lumière (2 ; 54) est une diode à laser émettant dans la plage non visible des infrarouges proches ou une diode émettant de la lumière, qui est formée avec une optique cylindrique ou un filtre de diffraction (4) pour former un éventail de lumière.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, dans lequel un dispositif (58) d'évaluation du signal différentiel ou d'une quantité multiple de signaux différentiels est en outre prévu pour commander l'état d'activation d'un coussin d'air (100) sur la base de l'évaluation.
  6. Dispositif selon la revendication 5, dans lequel le dispositif d'évaluation (58) évalue le ou les signaux différentiels au moyen d'un procédé de triangulation.
  7. Procédé de surveillance de siège dans des véhicules, ayant les étapes suivantes :
    a) exposition à la lumière d'un espace à surveiller au moyen d'une source de lumière (2 ; 54) monochromatique, alimentée de manière pulsée, avec utilisation d'un temps d'exposition dans la plage des microsecondes ou des nanosecondes ;
    b) enregistrement d'une première image de l'espace à surveiller pendant l'exposition à la lumière de l'étape a) au moyen d'un réseau de capteurs d'images (12 ; 50) ;
    c) enregistrement d'une deuxième image de l'espace à surveiller sans exposition à la lumière de cet espace par la source de lumière (2 ; 54) au maximum 10 ms avant ou après l'enregistrement de la première image ; et
    d) création d'une image différentielle à partir de la première image et de la deuxième image.
  8. Procédé selon la revendication 7, qui présente en outre l'étape de commande de l'état d'activation d'un ou de plusieurs coussins d'air (100) sur la base d'une ou de plusieurs images différentielles.
  9. Procédé selon la revendication 8, dans lequel un procédé de triangulation est exécuté sur la base d'une ou de plusieurs images différentielles pour commander l'état d'activation d'un ou de plusieurs coussins d'air (100) sur la base des résultats du procédé de triangulation.
EP99931166A 1999-06-24 1999-06-24 Dispositif et procede de surveillance de siege a l'aide d'une technique de triangulation optoelectronique Expired - Lifetime EP1185442B1 (fr)

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Application Number Priority Date Filing Date Title
PCT/EP1999/004388 WO2001000459A1 (fr) 1999-06-24 1999-06-24 Dispositif et procede de surveillance de siege a l'aide d'une technique de triangulation optoelectronique

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EP1185442A1 EP1185442A1 (fr) 2002-03-13
EP1185442B1 true EP1185442B1 (fr) 2003-07-09

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US (1) US6678598B1 (fr)
EP (1) EP1185442B1 (fr)
DE (1) DE59906278D1 (fr)
WO (1) WO2001000459A1 (fr)

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WO2001000459A1 (fr) 2001-01-04

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